I looked at doing this years ago, there quite big in the states, mostly used on caravans, dont know of anyone doing em here, not to say that there isnt!!

If you mean the same thing that Moocha has put a link up to... Due to the lack of width between neighbouring fences at my place to be able to swing the trailer in to its space using the Prado, I certainly need something like this to control my trailer on the part of our driveway with the gradient. With one person trying to control the boat and trailer (750kg+), it does as it pleases.

Landlord won't see the funny side if it goes through the front of his house!

Finatic wrote: If you mean the same thing that Moocha has put a link up to... Due to the lack of width between neighbouring fences at my place to be able to swing the trailer in to its space using the Prado, I certainly need something like this to control my trailer on the part of our driveway with the gradient. With one person trying to control the boat and trailer (750kg+), it does as it pleases. Landlord won't see the funny side if it goes through the front of his house!

get your ass to the gym lazy hua and cut out the pies

Some interesting options here.

Blue Legend wrote: Some interesting options here.   http://www.youtube.com/watch?v=f7Eu78LDYiA&feature=player_embedded

Try the eezi-mover jockey wheel with a ratchet handle that moved the wheel.  It will handle moderate grade driveway single handed.From memory they retail around $250

I looked at making one out of an old rotary hoe a while back as we have a steep short ramp to get up, but in the end I sunk a removeable post into the driveway and mounted a hand winch to it. 

You could copy something like this design... Probably not much use if there's a gradient though.

Maybe convert a motorized golf buggy? and attache tow ball.

Electric winch attached to the back of the trailer..at a suitable point that can be removed easily with a remote control.  Back a boat wherever you want to go